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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_CE26782E2D5D33C67C84F7E81DE54197" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_E83484AAC737F5D3EF7BF7E81DE5851A_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_E83484AAC737F5D3EF7BF7E81DE5851A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_7DDDE239D0B298D4F8D8F7E81DE59F50" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7424F5D8BAB6D016F169F7E81DE6B678" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_28CB83DB20B62EED2917F7E81DE6341F_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_28CB83DB20B62EED2917F7E81DE6341F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from disposition of non-marketable securities</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_68EAE1B11621E3FC1DEEF7E81DE6C4F2_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_68EAE1B11621E3FC1DEEF7E81DE6C4F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Debt Securities, Available-for-sale</link:label>
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    <link:label id="lab_klac_NoncashOrPartNoncashAcquisitionContingentConsiderationPayable_14492B709B633FA8BA46F7E81DEAF967_documentation_en-US" xlink:label="lab_klac_NoncashOrPartNoncashAcquisitionContingentConsiderationPayable_14492B709B633FA8BA46F7E81DEAF967" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Noncash Or Part Noncash Acquisition, Contingent Consideration Payable</link:label>
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    <link:label id="lab_klac_NoncashTransactionIncreaseDecreaseInDividendsPayable_5A97483D37A573543824F7E81DEB1014_terseLabel_en-US" xlink:label="lab_klac_NoncashTransactionIncreaseDecreaseInDividendsPayable_5A97483D37A573543824F7E81DEB1014" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends payable - financing activities</link:label>
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    <link:label id="lab_klac_StockRepurchaseProgramUnsettledCommonStockRepurchase_1259692A0FE19DA9A3E0F7E81DEBB489_terseLabel_en-US" xlink:label="lab_klac_StockRepurchaseProgramUnsettledCommonStockRepurchase_1259692A0FE19DA9A3E0F7E81DEBB489" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsettled common stock repurchase - financing activities</link:label>
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    <link:label id="lab_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_4C74AA36398B0EB65894F7E81DEB0B95_terseLabel_en-US" xlink:label="lab_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_4C74AA36398B0EB65894F7E81DEB0B95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued purchases of land, property and equipment - investing activities</link:label>
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    <link:label id="lab_us-gaap_VariableRateDomain_C64B6E2EAC42E1EC017FC081B273E8D6_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_C64B6E2EAC42E1EC017FC081B273E8D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:label id="lab_us-gaap_VariableRateDomain_C64B6E2EAC42E1EC017FC081B273E8D6_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_C64B6E2EAC42E1EC017FC081B273E8D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
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    <link:label id="lab_klac_AlternativeBaseRateMember_06A937CFCFCF49A911C0C081B2745FB7_terseLabel_en-US" xlink:label="lab_klac_AlternativeBaseRateMember_06A937CFCFCF49A911C0C081B2745FB7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternative base rate</link:label>
    <link:label id="lab_klac_AlternativeBaseRateMember_06A937CFCFCF49A911C0C081B2745FB7_label_en-US" xlink:label="lab_klac_AlternativeBaseRateMember_06A937CFCFCF49A911C0C081B2745FB7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternative Base Rate [Member]</link:label>
    <link:label id="lab_klac_AlternativeBaseRateMember_06A937CFCFCF49A911C0C081B2745FB7_documentation_en-US" xlink:label="lab_klac_AlternativeBaseRateMember_06A937CFCFCF49A911C0C081B2745FB7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alternative Base Rate [Member]</link:label>
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    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_246190810DB2DA756EFEC081B2748B6A_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_246190810DB2DA756EFEC081B2748B6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIBOR</link:label>
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_246190810DB2DA756EFEC081B2748B6A_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_246190810DB2DA756EFEC081B2748B6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D0ED19E3C3F20E8FB056C081B275681A_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D0ED19E3C3F20E8FB056C081B275681A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D0ED19E3C3F20E8FB056C081B275681A_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D0ED19E3C3F20E8FB056C081B275681A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D0ED19E3C3F20E8FB056C081B275681A" xlink:type="locator" />
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    <link:label id="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048_terseLabel_en-US" xlink:label="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase limit to borrowing capacity</link:label>
    <link:label id="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048_label_en-US" xlink:label="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Accordion Feature, Increase Limit</link:label>
    <link:label id="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048_documentation_en-US" xlink:label="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Accordion Feature, Increase Limit</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit" xlink:label="loc_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048" xlink:to="lab_klac_LineOfCreditFacilityAccordionFeatureIncreaseLimit_20A34112E8420110B739C081B2750048" xlink:type="arc" />
    <link:label id="lab_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6_terseLabel_en-US" xlink:label="lab_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowing capacity increase</link:label>
    <link:label id="lab_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6_label_en-US" xlink:label="lab_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Increase Limit</link:label>
    <link:label id="lab_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6_documentation_en-US" xlink:label="lab_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Increase Limit</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_LineOfCreditFacilityIncreaseLimit" xlink:label="loc_klac_LineOfCreditFacilityIncreaseLimit_CFFD7FF02A465A0B043CC081B27605E6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_7CF64BF9E7801ABB266BC081B2764E81_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_7CF64BF9E7801ABB266BC081B2764E81" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amount borrowed</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_7CF64BF9E7801ABB266BC081B2764E81" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_7D903FAC340E4C114A44C081B276B738_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_7D903FAC340E4C114A44C081B276B738" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal payments</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_7D903FAC340E4C114A44C081B276B738_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_7D903FAC340E4C114A44C081B276B738" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Long-term Lines of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_7D903FAC340E4C114A44C081B276B738" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentTerm_F8D8CAF665510B033C62C081B2766419_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_F8D8CAF665510B033C62C081B2766419" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, term</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTerm_F8D8CAF665510B033C62C081B2766419_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_F8D8CAF665510B033C62C081B2766419" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_F8D8CAF665510B033C62C081B2766419" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Borrowings under the revolving credit facility</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4" xlink:to="lab_us-gaap_LineOfCredit_7082C91404D3FCE7E1FEC081B276F5C4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1D2D44EFEA2B79FDE69EC081B276E1F0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1D2D44EFEA2B79FDE69EC081B276E1F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis spread on variable rate (in bps)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1D2D44EFEA2B79FDE69EC081B276E1F0_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1D2D44EFEA2B79FDE69EC081B276E1F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1D2D44EFEA2B79FDE69EC081B276E1F0" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1D2D44EFEA2B79FDE69EC081B276E1F0" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_106DB6A15F11F476C18FC081B277A848_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_106DB6A15F11F476C18FC081B277A848" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitment fee percentage (in bps)</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_106DB6A15F11F476C18FC081B277A848_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_106DB6A15F11F476C18FC081B277A848" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_106DB6A15F11F476C18FC081B277A848" xlink:type="locator" />
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    <link:label id="lab_klac_DebtInstrumentCovenantComplianceNumberofConsecutiveQuarters_F793D975EDF2D4613490C081B27715D3_terseLabel_en-US" xlink:label="lab_klac_DebtInstrumentCovenantComplianceNumberofConsecutiveQuarters_F793D975EDF2D4613490C081B27715D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Covenant compliance, number of consecutive quarters</link:label>
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    <link:label id="lab_klac_SeniorNotesDueNovember12019Member_D3A8EFAF805FA84D24A9D97C59159BCC_label_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12019Member_D3A8EFAF805FA84D24A9D97C59159BCC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2019 [Member]</link:label>
    <link:label id="lab_klac_SeniorNotesDueNovember12019Member_D3A8EFAF805FA84D24A9D97C59159BCC_documentation_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12019Member_D3A8EFAF805FA84D24A9D97C59159BCC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2019 [Member]</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_SeniorNotesDueNovember12019Member" xlink:label="loc_klac_SeniorNotesDueNovember12019Member_D3A8EFAF805FA84D24A9D97C59159BCC" xlink:type="locator" />
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    <link:label id="lab_klac_SeniorNotesDueNovember12021Member_C07C00834A011C564955D97C59155964_terseLabel_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12021Member_C07C00834A011C564955D97C59155964" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed-rate 4.125% Senior Notes due on November 1, 2021</link:label>
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    <link:label id="lab_klac_SeniorNotesDueNovember12021Member_C07C00834A011C564955D97C59155964_documentation_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12021Member_C07C00834A011C564955D97C59155964" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2021 [Member]</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_SeniorNotesDueNovember12021Member" xlink:label="loc_klac_SeniorNotesDueNovember12021Member_C07C00834A011C564955D97C59155964" xlink:type="locator" />
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    <link:label id="lab_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D_terseLabel_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed-rate 4.650% Senior Notes due on November 1, 2024</link:label>
    <link:label id="lab_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D_label_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2024 [Member]</link:label>
    <link:label id="lab_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D_documentation_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2024 [Member]</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_SeniorNotesDueNovember12024Member" xlink:label="loc_klac_SeniorNotesDueNovember12024Member_8BD2BF89C9F486F604C4D97C5915B82D" xlink:type="locator" />
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    <link:label id="lab_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B_terseLabel_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed-rate 5.650% Senior Notes due on November 1, 2034</link:label>
    <link:label id="lab_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B_label_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2034 [Member]</link:label>
    <link:label id="lab_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B_documentation_en-US" xlink:label="lab_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Due November 1, 2034 [Member]</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_SeniorNotesDueNovember12034Member" xlink:label="loc_klac_SeniorNotesDueNovember12034Member_7DE704484DD6271E2D93D97C5915F62B" xlink:type="locator" />
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    <link:label id="lab_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51_terseLabel_en-US" xlink:label="lab_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed-rate 4.100% Senior Notes due on March 15, 2029</link:label>
    <link:label id="lab_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51_label_en-US" xlink:label="lab_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due March 15, 2029 [Member]</link:label>
    <link:label id="lab_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51_documentation_en-US" xlink:label="lab_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Due March 15, 2029 [Member]</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_SeniorNotesDueMarch152029Member" xlink:label="loc_klac_SeniorNotesDueMarch152029Member_C21F5FEFE18A84308FEFD97C59153C51" xlink:type="locator" />
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    <link:label id="lab_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C_terseLabel_en-US" xlink:label="lab_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed-rate 5.000% Senior Notes due on March 15, 2049</link:label>
    <link:label id="lab_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C_label_en-US" xlink:label="lab_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Due March 15, 2049 [Member]</link:label>
    <link:label id="lab_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C_documentation_en-US" xlink:label="lab_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Due March 15, 2049 [Member]</link:label>
    <link:loc xlink:href="klac-20191231.xsd#klac_SeniorNotesDueMarch152049Member" xlink:label="loc_klac_SeniorNotesDueMarch152049Member_5688D62647BCA4F15EDFD97C5915651C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F50B93F31B32F4A21227D97C59175885_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F50B93F31B32F4A21227D97C59175885" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_FA78103D92A04ABFBF14D97C5917BDAA_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_FA78103D92A04ABFBF14D97C5917BDAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total debt, gross</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_FA78103D92A04ABFBF14D97C5917BDAA_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_FA78103D92A04ABFBF14D97C5917BDAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Gross</link:label>
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    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_64C382BECE111CC502D7F7E81CB1A23B_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_64C382BECE111CC502D7F7E81CB1A23B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense, Current</link:label>
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    <link:label id="lab_klac_DebtSecuritiesAvailableforsaleMaturityAllocatedandSingleMaturityDateafterOneThroughThreeYearsFairValue_1F85D46CC8C1D1437CC2264D7CB5885B_terseLabel_en-US" xlink:label="lab_klac_DebtSecuritiesAvailableforsaleMaturityAllocatedandSingleMaturityDateafterOneThroughThreeYearsFairValue_CCB047DB619A56BBA0EA6047AF6942EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due after one year through three years</link:label>
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    <link:loc xlink:href="klac-20191231.xsd#klac_DebtSecuritiesAvailableforsaleMaturityAllocatedandSingleMaturityDateafterOneThroughThreeYearsFairValue" xlink:label="loc_klac_DebtSecuritiesAvailableforsaleMaturityAllocatedandSingleMaturityDateafterOneThroughThreeYearsFairValue_CCB047DB619A56BBA0EA6047AF6942EC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtSecurities_DB710223CDA374D528DF264D7CB55898_totalLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtSecurities_9451A208A82754BF807FF7B9BC3B95F2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Marketable securities, Fair value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_9451A208A82754BF807FF7B9BC3B95F2" xlink:type="locator" />
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    <link:label id="lab_klac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentUncertainTaxPosition_2852BE6DDD8C3A10D459D97C598AB11D_terseLabel_en-US" xlink:label="lab_klac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentUncertainTaxPosition_2852BE6DDD8C3A10D459D97C598AB11D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reserves for uncertain tax positions</link:label>
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    <link:loc xlink:href="klac-20191231.xsd#klac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentUncertainTaxPosition" xlink:label="loc_klac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentUncertainTaxPosition_2852BE6DDD8C3A10D459D97C598AB11D" xlink:type="locator" />
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